'duty free' cameras?

I need a new camera for my holidays, a decent point and shoot will do. Are there significant savings to be made if I wait and buy one at the airport (Heathrow) on the way out? Or are they marked up above usual high street/internet prices?

Yeah, it's a con. You'll get better deals by looking for specials elsewhere. The duty free shops rely on people having preconceptions that it's cheap, and being bored wandering around airports. And being in a holiday mood I suppose.